Nonlinear aeroelastic analysis of the folding fin with freeplay under thermal environment  

作　　者：Haonan HE Hong TANG Kaiping YU Jinze LI Ning YANG Xiaolei ZHANG 

机构地区：[1]Department of Astronautical Science and Mechanics.Harbin Institute of Technology,Harbin 150001,China [2]Beijing Institute of Electronic System Engineering,Beijing 100854,China

出　　处：《Chinese Journal of Aeronautics》2020年第9期2357-2371,共15页中国航空学报（英文版）

摘　　要：The nonlinear aeroelastic behavior of a folding fin in supersonic flow is investigated in this paper.The finite element model of the fin is established and the deployable hinges are represented by three torsion springs with the freeplay nonlinearity.The aerodynamic grid point is assumed to be at the center of each aerodynamic box for simplicity.The aerodynamic governing equation is given by using the infinite plate spline method and the modified linear piston theory.An improved fixed-interface modal synthesis method,which can reduce the rigid connections at the interface,is developed to save the problem size and computation time.The uniform temperature field is applied to create the thermal environment.For the linear flutter analyses,the flutter speed increases first and then decreases with the rise of the hinge stiffness due to the change of the flutter coupling mechanism.For the nonlinear analyses,a larger freeplay angle results in a higher vibration divergent speed.Two different types of limit cycle oscillations and a multiperiodic motion are observed in the wide range of airspeed under the linear flutter boundary.The linear flutter speed shows a slight descend in the thermal environment,but the effect of the temperature on the vibration divergent speed is different under different hinge stiffnesses when there exists freeplay.

关 键 词：Aeroelasticity Fixed-interface modal synthesis method Folding fin Freeplay Thermal environment 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]